不加on。 tomorrow表示“在明天”的时候tomorrow本身是个副词,副词前面不需要介词。比如判氏我们常说“明天见。”英语See you tomorrow。tomorrow 英[təˈmɒrəʊ] 美[təˈmɑ:roʊ] adv. 在明天,在明日; n. 明天; 最近,不远的将来; [例句]1、Bye, see you tomorrow.再见,明天见。2、What is education going to look like tomorrow? 未来的教育会是什么样子?3、The first official results will be announced tomorrow. 第一批官方结果将于明天宣布。4、What about going out with me tomorrow? 明天和我一起出去怎么样?5、So you won't go tomorrow, eh? 啊,那么你明天不去了?6、I hate to tell you this, but tomorrow's your last day. 我很抱歉地通知你,明天是你的最后一天了。7、含冲雹I'll explain tomorrow morning. 明天早上我会谈帆解释的。8、I shall get in touch with him tomorrow. 我明天和他接头。